I noticed the following on my car, a Hyundai Ioniq AE 28kWh. Unfortunately, the 12V battery discharged several times in the cold weather and I was looking for a solution to fix this.
The selected car kept the car awake all the time and the consumption was > 500mA.
Then I started switching the module to NONE when I wasn't driving it or charging it and then I ran into the error that polling doesn't work anymore.

I'm attaching a command output.
If I restart OVMS (module reset), it works fine again until I switch to NONE.